CVE-2026-110447
CriticalExploitedCollabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208.
Published Oct 14, 2026 · Updated Oct 16, 2026 · Also known as EUVD-2026-100780, GHSA-f97p-r72q-64h2
Key Facts
Patch immediately- CVE-2026-110447 is a critical-severity vulnerability (CVSS 9.2 v4) affecting Collabora Online - Built-in CODE Server, richdocumentscode.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 14, 2026. No public exploit code is known.
- EPSS estimates a 1.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Collabora Online - Built-in CODE Server 26.4.303, richdocumentscode 26.4.303.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (30-day exploit likelihood)
1.2%
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
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Description
Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208. This is an OS command injection in proxy.php when the CODE server isn't running (e.g., the product was recently restarted). The vulnerability is not present in standalone Collabora Online servers; only this deployment with CODE Server is affected.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 14, 2026 | n/a | Not reported |
| CIRCL KEV | Oct 14, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Collabora Online - Built-in CODE Server | See advisory | 26.4.303 |
| richdocumentscode | See advisory | 26.4.303 |
Patched Releases
Collabora Online - Built-in CODE Server
26.4.303
richdocumentscode
26.4.303
Timeline
Publicly disclosed
Oct 14, 2026
Added to Industry KEV feed
Oct 14, 2026
Added to CIRCL KEV
Oct 14, 2026
Last updated
Oct 16, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110447.json
- advisoryVulnCheck exploitation report
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-110447
- exploitVulnCheck exploitation report
- articlehttps://apps.nextcloud.com
FAQ
Common Questions.
Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208.
Affected: Collabora Online - Built-in CODE Server; richdocumentscode. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 14, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Collabora Online - Built-in CODE Server 26.4.303, richdocumentscode 26.4.303.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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